export function isPointInCircle(point, circle = {}) {
  //检查类型是否正确
  if (!(point instanceof BMap.Point) || !(circle instanceof BMap.Circle)) {
    return false
  }

  //point与圆心距离小于圆形半径，则点在圆内，否则在圆外
  var c = circle.getCenter()
  var r = circle.getRadius()

  var dis = getDistance(point, c)
  if (dis <= r) {
    return true
  } else {
    return false
  }
}

function getDistance(point1, point2) {
  var EARTHRADIUS = 6370996.81
  //判断类型
  if (!(point1 instanceof BMap.Point) || !(point2 instanceof BMap.Point)) {
    return 0
  }

  point1.lng = _getLoop(point1.lng, -180, 180)
  point1.lat = _getRange(point1.lat, -74, 74)
  point2.lng = _getLoop(point2.lng, -180, 180)
  point2.lat = _getRange(point2.lat, -74, 74)

  var x1, x2, y1, y2
  x1 = degreeToRad(point1.lng)
  y1 = degreeToRad(point1.lat)
  x2 = degreeToRad(point2.lng)
  y2 = degreeToRad(point2.lat)

  return (
    EARTHRADIUS *
    Math.acos(
      Math.sin(y1) * Math.sin(y2) +
        Math.cos(y1) * Math.cos(y2) * Math.cos(x2 - x1)
    )
  )
}
function _getLoop(v, a, b) {
  while (v > b) {
    v -= b - a
  }
  while (v < a) {
    v += b - a
  }
  return v
}
function _getRange(v, a, b) {
  if (a != null) {
    v = Math.max(v, a)
  }
  if (b != null) {
    v = Math.min(v, b)
  }
  return v
}

function degreeToRad(degree) {
  return (Math.PI * degree) / 180
}